# US 10,245,475 B2 · Golf club head and golf club

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- Number: US 10,245,475 B2
- Document ID: US10245475B2
- Status: Granted
- Kind: B2
- Application number: 15/652,969
- Filed: 2017-07-18
- Published: 2019-01-24
- Granted: 2019-04-02
- Earliest claimed: 2017-07-18
- Assignees: Mizuno Corporation
- Applicants: Mizuno Corporation
- Inventors: Tomoaki Aoki; Daisuke Hosooka; Kazuhiro Doi
- Web page: https://patentgrep.com/patent/US10245475B2

## CPC

- A63B 53/04: Heads
- A63B 53/0466: {wood-type}
- A63B 53/047: {iron-type}
- A63B 53/0475: {with one or more enclosed cavities}
- A63B 53/0408: {characterised by specific dimensions, e.g. thickness}
- A63B 53/0433: {with special sole configurations}
- A63B 53/0458: {with non-uniform thickness of the impact face plate}
- A63B 53/0462: {characterised by tapering thickness of the impact face plate}
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A golf club head according to an embodiment includes a face having a ball striking surface and a back surface. The back surface of the face has a thick portion located at a generally center portion thereof in a direction from the toe toward the heel, a thin portion located around the thick portion, and a tapered portion located between the thick portion and the thin portion. The thick portion has a first width which is a width in a heel-toe direction, and a second width which is a width in a sole-top direction and is larger than the first width, and the thick portion also has a first thickness. The thin portion has a second thickness smaller than the first thickness. The tapered portion has a thickness reduced from the side of the thick portion toward the side of the thin portion.

## Claims

### Claim 1

An iron golf club head comprising:
a face having a ball striking surface and a back surface opposite to the ball striking surface,
a sole portion constituting a bottom portion of the iron golf club head,
an edge portion provided at the back surface and defining a cavity, the edge portion having an undercut portion,
the back surface of the face having a thick portion located at a generally center portion thereof in a direction from a toe of the golf club head toward a heel of the golf club head, a thin portion located around the thick portion, and a tapered portion located between the thick portion and the thin portion,
the thick portion having a first width which is a width in a direction from the heel of the golf club head toward the toe of the golf club head, and a second width which is a width in a direction from the sole of the golf club head toward a top of the golf club head and larger than the first width, the thick portion also having a first thickness,
wherein the thick portion extends from an upper surface the sole portion located in the undercut portion,
wherein the thick portion is connected to the sole portion via a fillet portion,
the thin portion having a second thickness smaller than the first thickness, wherein the second thickness of the thin portion is a constant thickness,
the tapered portion having a thickness reduced from a side of the thick portion toward a side of the thin portion, and
at least a part of the thick portion being located in the undercut portion.

### Claim 2 (depends on 1)

The iron golf club head according to claim 1, wherein the first thickness and the second thickness have a difference of 0.25 mm or more and 1.25 mm or less.

### Claim 3 (depends on 1)

The iron golf club head according to claim 1, wherein:
the tapered portion has a third width; and
the third width is 2 mm or more and 20 mm or less.

### Claim 4 (depends on 1)

The iron golf club head according to claim 1, wherein:
the tapered portion has a third width; and
a value of the first width plus the third width multiplied by two, divided by a length from the sole to a top portion of the tapered portion, is 0.5 or less.

### Claim 5 (depends on 1)

An iron golf club comprising the iron golf club head according to claim 1.